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Igor Sutyagin - Wikipedia
Dr Igor Sutyagin - Royal United Services Institute
Igor Sutyagin - Bulletin of the Atomic Scientists
Profile: Russian spies released - BBC News
Igor Sutyagin: 'Your letters kept me going in prison' - YouTube
Igor Sutyagin - European Leadership Network
Igor Sutyagin - Wikiwand articles
Interview: Igor Sutyagin Discusses 'Spy Swap,' Life In England
Igor Sutyagin - Research Fellow - Royal United Services Institute ...